Key Takeaways
- Silverfish eat starchy, sugary, and protein-rich materials including paper, glue, fabric, and dried foods.
- Their diet centers on polysaccharides like cellulose and starch, which are found in everyday household items.
- Silverfish can survive for months without food, making them especially difficult to starve out of your home.
- Reducing moisture and removing accessible food sources are the two most effective ways to discourage silverfish.
- Items stored in dark, humid areas — such as basements, attics, and closets — face the highest risk of silverfish damage.
What do silverfish eat? The answer might surprise you — and it probably includes items you have sitting in every room of your house right now. These small, wingless insects are some of the most versatile feeders in the pest world. Unlike many common household pests profiled in our silverfish facts and info library, silverfish don’t need crumbs on the counter to thrive. They feast on paper, fabric, adhesives, dried food, and even the wallpaper on your walls. Understanding their diet is the first step toward protecting your belongings and keeping these nocturnal invaders out of your home for good. Below, you’ll learn exactly which materials silverfish target, why they prefer certain foods, and how to use that knowledge to prevent damage.
Why Do Silverfish Eat Such Unusual Things?
Silverfish belong to the order Zygentoma, one of the oldest insect orders on Earth. They’ve been around for over 400 million years — long before dinosaurs roamed the planet. That evolutionary history explains a lot about what silverfish eat.
Their digestive systems are built to break down polysaccharides, which are complex carbohydrates found in natural materials. Cellulose, starch, and dextrin are their primary nutritional targets. These compounds appear in everything from book bindings to cereal boxes.
Because silverfish evolved long before processed human food existed, they adapted to consume organic matter that most other pests ignore. This gives them a unique advantage inside modern homes, where starchy and cellulose-rich materials are everywhere.
What Do Silverfish Eat in Your Home?
Silverfish are generalist feeders. They don’t have a single preferred food — they eat whatever starchy, sugary, or protein-based material they encounter. Here’s a breakdown of the most common items silverfish consume inside homes.
Paper and Books
Paper is one of the top food sources for silverfish. They consume the cellulose fibers in paper products, including:
- Books and book bindings
- Newspapers and magazines
- Cardboard boxes
- Wallpaper and wallpaper paste
- Important documents, certificates, and photographs
You’ll often notice irregular holes, surface scraping, or yellowish stains on paper products that silverfish have fed on. Old books stored in damp basements are especially vulnerable.
Clothing and Fabrics
Silverfish eat both natural and synthetic fabrics, though they strongly prefer natural fibers. Cotton, linen, silk, and rayon are common targets. They chew small holes or scrape the surface of the material, leaving behind thin, damaged patches.
Clothes stored in dark closets or packed away in boxes for long periods face the greatest risk. Silverfish are particularly drawn to garments with food stains or body oils, which provide extra protein and salt.
Glue and Adhesives
The starch-based adhesives used in bookbinding, wallpaper paste, envelope glue, and packaging tape are silverfish favorites. If you’ve ever found wallpaper peeling away from the wall in a damp bathroom, silverfish may have eaten the paste behind it. They also target the glue in cardboard boxes and labels.
Dried and Pantry Foods
Silverfish will readily eat dry goods stored in your kitchen or pantry. Their preferred pantry items include:
- Flour and oats
- Cereal and pasta
- Sugar and dried spices
- Pet food (dry kibble)
- Coffee and tea
Unsealed bags, open containers, and spilled crumbs attract silverfish to kitchens. Transferring pantry staples into airtight containers is a simple but effective prevention measure.
Other Surprising Food Sources
Silverfish eat materials you might never suspect. They consume dandruff, dead skin cells, hair, and even dead insects. They’ve also been known to feed on plaster, paint, and certain types of insulation. In severe infestations, silverfish will eat the sizing in drywall or the starch coatings on photographs.
This broad diet makes silverfish extremely resilient. Even in homes that seem clean, there’s almost always something available for them to eat.
Silverfish Diet Compared to Other Common Pests
It helps to understand how the silverfish diet stacks up against other household pests. This comparison highlights just how unique their feeding habits are.
| Pest | Primary Diet | Household Items at Risk |
|---|---|---|
| Silverfish | Starches, cellulose, sugars, protein | Books, wallpaper, clothing, dry food |
| Carpet Beetles | Keratin, natural fibers | Wool, leather, fur, silk |
| Cockroaches | Almost anything organic | Food scraps, grease, garbage |
| Moths | Natural fibers (keratin) | Wool clothing, blankets, upholstery |
| Termites | Cellulose (wood) | Structural wood, wooden furniture |
As you can see, silverfish share some overlap with carpet beetles and moths in their attraction to fabrics. However, silverfish are far more diverse eaters. Their willingness to consume paper, glue, and dried food sets them apart from nearly every other common indoor pest.
How Long Can Silverfish Survive Without Food?
One of the most frustrating facts about silverfish is their ability to survive extended periods without eating. Silverfish can go several months to a full year without food, provided they have access to moisture.
Humidity is actually more critical to their survival than food. Silverfish thrive in environments with 75–90% relative humidity. In dry conditions, they dehydrate and die relatively quickly. However, in a damp basement or humid bathroom, they can persist for a remarkably long time even when food seems scarce.
This survival ability means you can’t simply remove food sources and expect silverfish to disappear on their own. You need a combined strategy that addresses both food and moisture. For a thorough, step-by-step approach to elimination, read our guide on how to get rid of silverfish once and for all.
Which Rooms Are Most at Risk for Silverfish Feeding?
Silverfish gravitate toward specific areas of the home that offer the right combination of darkness, moisture, and food. Knowing where they feed helps you focus your prevention efforts.
Basements and Attics
Basements and attics are silverfish hotspots. They’re typically humid, rarely disturbed, and packed with stored items like cardboard boxes, old books, and clothing. These spaces provide both shelter and an all-you-can-eat buffet for silverfish.
Bathrooms and Kitchens
Bathrooms supply the moisture silverfish need. They’ll eat soap residue, paper products, and even toothpaste. Kitchens offer dried food, cardboard packaging, and paper towels. Under sinks, where pipes create condensation, is a particularly common hiding and feeding spot.
Closets and Storage Areas
Walk-in closets, linen closets, and storage rooms are ideal feeding zones. Silverfish feed on stored clothing, fabric, and the cardboard or paper used to organize these spaces. Seasonal clothing stored for months without disturbance is a frequent target.
How to Protect Your Belongings From Silverfish Damage
Since you now know what silverfish eat, you can take specific steps to make your home less appealing. The strategy is straightforward: remove their food sources and reduce the humidity they depend on.
- Store books and documents in sealed plastic containers rather than cardboard boxes.
- Replace cardboard storage boxes with airtight plastic bins, especially in basements and attics.
- Keep pantry items in sealed glass or plastic containers to eliminate easy access to flour, cereal, and sugar.
- Use a dehumidifier in basements, bathrooms, and other high-moisture areas to keep relative humidity below 50%.
- Fix leaky pipes and faucets promptly — even small drips create the moisture silverfish need.
- Vacuum regularly, especially in corners, closets, and under furniture, to remove food debris, dead skin, and hair.
- Launder or dry-clean clothes before storing them for long periods, since body oils and food stains attract silverfish.
Understanding where silverfish come from and how they enter your home can also help you seal potential entry points before they ever reach your belongings.
Signs That Silverfish Are Eating Your Things
Silverfish are nocturnal and shy, so you may not see them in action. Instead, look for evidence of their feeding activity:
- Irregular holes and notches in paper, cardboard, or fabric
- Surface scraping on book covers, photos, or wallpaper
- Yellowish stains on paper, clothing, or fabric
- Tiny pepper-like droppings (feces) near feeding sites
- Shed skins — silverfish molt throughout their lives, leaving behind translucent exoskeletons
If you spot these signs in multiple rooms, you’re likely dealing with a well-established infestation. At that point, removing food sources alone won’t be enough. You’ll want to combine prevention strategies with active treatment methods. Our comprehensive guide on getting rid of silverfish walks you through both DIY and professional options.
Do Silverfish Eat Certain Materials More in Humid Climates?
Absolutely. In warm, humid climates — like those found throughout South Florida — silverfish activity intensifies. Higher humidity softens paper, fabric, and adhesives, making them easier for silverfish to consume. Mold and mildew that develop in damp environments also serve as supplemental food sources.
Homes in humid regions face a year-round silverfish risk, not just a seasonal one. That’s why moisture control is the single most impactful step you can take. Running air conditioning, using exhaust fans in bathrooms, and maintaining proper ventilation in crawl spaces all help reduce the conditions silverfish need to feed and thrive.
If silverfish have already established themselves despite your best prevention efforts, professional pest control can target the population directly while you work on long-term environmental changes. A combination of treatment and prevention delivers the most lasting results.
Frequently Asked Questions
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Do silverfish eat cotton and synthetic clothing?
Yes, silverfish eat both cotton and synthetic fabrics, though they prefer natural fibers like cotton, linen, and silk. They're especially attracted to clothes with food stains, sweat, or body oils, which provide extra protein and salt.
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Can silverfish eat through plastic bags and containers?
Silverfish cannot chew through hard plastic containers. However, they can sometimes work their way through thin plastic bags. For reliable protection, store vulnerable items in rigid, airtight plastic bins with secure lids.
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Will removing food sources alone get rid of silverfish?
Removing food sources helps, but it's rarely enough on its own. Silverfish can survive for months without eating as long as they have moisture. You need to address both food availability and humidity levels to see real results.
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What food attracts silverfish the most?
Starchy materials attract silverfish the most. Paper, cardboard, wallpaper paste, and flour are among their top targets. They're drawn to any item rich in cellulose, starch, or dextrin, which are complex carbohydrates their digestive systems efficiently process.
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Do silverfish eat wood like termites do?
No, silverfish do not eat wood. While both silverfish and termites consume cellulose, silverfish target paper, fabric, and adhesives rather than structural wood. If you find wood damage in your home, termites or carpenter ants are more likely culprits.
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Are silverfish dangerous to humans if they eat so many things?
Silverfish are not dangerous to humans. They don't bite, sting, or transmit diseases. However, their feeding habits can cause significant property damage to books, clothing, wallpaper, photographs, and stored food if an infestation goes unchecked.